Draw frame



April 29, 1941. L PP v 2,239,863

DRAW FRAME Filed July 5, 1938 v 'w ITNESS NTOR ATTORNEYS Patented Apr.29, 1941 DRAW FRAME Ludwig Schlipp, Kassel, Germany, assignor toSpinnfaser Aktiengesellschaft, Kassel-Bettenhausen, Germany, acorporation of Germany Application July 5, 1938, Serial No. 217,383

In Germany October 22, 1937 8 Claims.

This invention relates to drawing frames and has particular reference toleather belt drawing frames for doubling, drawing and spinning slivers.

Leather belt drawing frames according to the principle of Casablancagenerally comprise, apart from a pair of feed rollers and a pair ofdrawing rollers, a pair of leather belts which are driven by two rollerspositioned at the entrance of the sliver and guided, in the movingdirection of the sliver, around two guiding rods. As is well known, veryfavorable conditions are thus created for drawing the silver in thedrawing frame between the nipping points formed by the leather taperollers on the one hand and the two following drawing rollers on theother hand.

It is already known that the distance apart of the two aforementionednipping points formed by the nipping roller pair on the one hand and thedrawing roller pair on the other hand determines the maximum length offibre that can be spun in the drawing work. Hitherto such drawing workshave been used with good success for spinning cotton, where a maximumlength of staple of 40 mm. occurs so that the fibre material is guidedin a very favorable manner between the running tapes.

Now, new problems have arisen in the spinning process with a view to theworking of the new cellulose wool. Cellulose wool can be cut to staplesof large or small length as desired and, of course, in many instances itis desired to spin relatively long artificial fibres and to mix suchfibres with cotton which naturally has a limited length. It will beunderstood that the drawing frames set to a short distance apart of thenipping points as heretofore used cannot be employed for spinning longerfibres of cellulose wool, cut for example to a length of staple of 50,60, 80 mm. and the like. In this case spinning machines have to be usedhaving a distance apart between the nipping lines corresponding to thegreater fibre length. Due to the larger distance between the nippinglines in turn a larger length of tape is required. Thus, the adhesionbetween the two cooperating sides of the two tapes is reduced, thepulled side of the lower tape no longer runs in an accurately straightdirection or even hangs down visibly and thus the guidance becomesinsufficient.

It is the object of my invention to remove these difliculties and toprovide a better guidance and adhesion for the operative tape side inthe frame or cage of greater length required for great length of staple.

Another object of the invention i to render it possible to spin fibresof quite different length of staple and to double rovings made of fibresof quite different length of staple, i. e. working each length ofmaterial separately or mixed material comprising fibres of dlfierentlength.

With these and further objects in view which will hereinafter appear Iprovide a member in the frame or cage of the drawing frame which exertspressure upon the operative band sides,

for example, deflects them from the straight direction, in order toincrease the pressure between the same. This member is adjustableaccording to the special working conditions, that is to say, as regardsthe amount of pressure and as regards the point in the drawing framewhere the pressure has to be exerted.

The device may take the form of a simple rod or of a simple rod-shapedroller which, for instance, is pressed from underneath against the loweroperative band side and urges the two operative belt sides upwards fromthe straight direction to form a slight bending, but may obviously bepressed from above with the same result. The rod or roller may bemounted on the frame or cage or on the two cage plates respectively.

Advantageously spaced communicating recesses or apertures of variabledepth are provided in the cage plates so as to receive the ends of therod or roller member whereby rod or roller can be mounted higher orlower or displaced forwardly or rearwardly for changing the amount andpoint of attack of the deflecting pressure.

The invention will be better understood by reference to the followingdetailed description in connection with the accompanying drawing showingby way of example and diagrammatically one embodiment of the invention.

Referring to the drawing, the leather belt drawing frame comprising asupporting cage or frame I is arranged between the feed rollers 2, 3 andthe drawing rollers 4, 5. The two leather belts 6 and l are driven bythe middle rollers comprising the driving roller 8 and the top roller 9,in such a manner that the two operating sides 6' and I of the leatherbelts run in the direction of the yarn or fibre and are guided, at theend of the cage, around the two guide rods Ill and I I. Arranged in thecage between the middle rollers B, 9 and the guide rods III, II is theadjustable auxiliary device or deflecting member which is shown in theform of a round rod or roller device l2, the two preferably squareshaped end portions of which may be selectively engaged in any of thespaced recesses H of variable depth in the two cage plates H in such amanner that the round rod l2 exerts more or less pressure in an upwarddirection at a suitable point of the operating sides of the leatherbelts and thus deflects the operating side of the lower leather beltmore or less from a straight direction.

As is made clear by the drawing, the rod or roller device i2 is, to allintents and purposes, in fixed position relative to the belt with whichit is in contact. The rod or roller device is set, or trunnioned, in thebottom of a slot, so that the pull of gravity, and also the pressureexerted by the belts, prevents it from rising, no matter what may be thetension on the operative band sides 6' l of the belts 6, l and, ofcourse, no change of pressure exerted by the belts could ever push itdownwardly. If the relative positions of the rod, or roller device, andthe belts were reversed, for instance, if the former were arrangedbetween the return points of belt i, and therefore pressed downwardlyupon the operative band sides of the belts, mechanically equivalentmeans for holding the roller in fixed position would be openings in theside plates which are like the slots as, but reversed, in connectionwith which the function performed by gravity in the lower position wouldbe performed by pins, plugs or other devices preventing downwardmovement of the rod or roller device.

By means of drawing frames which are thus modified it is possible tospin the new long fibres of cellulose wool of a length of 50, 60 or 810mm. length in a satisfactory and faultless manner.

My invention ofi'ers still further advantages as follows: Where longfibres of cellulose wool have to be spun to a thread together with verymuch shorter fibres, for example cotton fibres, I have found that it isnot at all sufilclent to enlarge the leather belts and the nipping pointdistance accordingly. The fibres, especially the short fibres, areinsufficiently guided even in the elongated cage and leather belts and,therefore, only a cut yarn results. On the other hand, according to myinvention it is possible to spin even such mixed fibres comprising longand very short fibres to a good yarn, since the said auxiliary devicepermits increase of the pressure and improvement of the guidance.Moreover, my improved drawing frame having a much larger distancebetween the pair of middle rollers and the pair of drawing rollers maybe used also for spinning yarns the longest fibres of which areconsiderably shorter than the nipping line distance, because by means ofmy adjustable tensioning or deflecting member, pressure may be exertedto the operating leather belt portions at a suitable point to increasethe adhesion at the respective point for forming an additional orauxiliary nipping point which renders it possible to spin also shortfibres alone, corresponding to the reduced distance between the drawingrollers and the said auxiliary nipping point. It will be understood thatwhile the said advantage is gained by the said auxiliary nipping point,the same will not positively retain or nip the fibres as, for instance,the middle cylinders or the drawing rollers. This offers the additionaladvantage that longer fibres that mayoccur in the material by chancewill not break at this auxiliary nipping line.

It will thus be understood that my improved drawing frame offers theadvantage that short fibres alone, such as fibres having the length ofthe usual cotton, as well as long fibres alone, such as cellulose woolhaving a length of staple of 50, 60, 80 mms. and the like, as well asmixed or blend yarn containing short and long fibres at the same timemay be spun with the aid of this drawing frame. Moreover. my improveddrawing frame is also suitable for doubling two different rovings, i. e.a roving consisting of short fibres and a roving consistingof longfibres. My drawing frame due to its special construction affords anequally good guidance for both kinds of fibre so. that a uniform threadis produced.

It will thus be noted that my novel drawing frame renders it possible tospin a faultless yarn from fibres of quite different length of staplemixed or separately worked or from two rovings of difierent length ofstaple by doubling said rovings, without any adjustment of rollers, onlyby action of the said adjustable auxiliary organ or deflecting member.

My invention will permit in future to admix with cotton, cellulose woolof much greater length of staple, irrespective of the length of stapleof the cotton material, whereby the strength of such mixed yarns can beconsiderably increased.

In a similar manner by means of my novel drawing frame, rovings of quitedifferent characteristics or origin may be doubled, as for instance,cottonand much longer cellulose wool, or flax and cotton or flax andcellulose wool and faultness yarns and new effects may thus be produced.

While I have herein shown and described certain preferred embodiments ofmy invention, I wish it to be understood that I do not confine myself toall the precise details herein set forth by way of illustration, asmodification and variation may be made without departing from the spiritof the invention or exceeding the scope of the appended claims.

I claim:

1. In a textile machine, a drawing frame comprising a pair of feedrollers, a pair of drawing rollers, a pair of endless belts intermediatesaid rollers, means for driving and guiding said belts at their returnpoints, plates on both sides of said belts for supporting said drivingand guiding means, a rod-shaped member adapted to support the upper sideof the lower belt at a point intermediate said return points, andrecesses in said plates for adjustably mounting said rod-shaped supportmember.

2. In a. textile machine, a drawing frame comprising a pair of feedrollers, a pair of drawing rollers, a pair of endless belts intermediatesaid rollers, means for driving and guiding said belts at their returnpoints, plates on both sides of said belts for supporting said drivingand guiding means, a rod-shaped member adapted to support the upper sideof the lower belt at a point intermediate said return points, and spacedcommunicating recesses of difierent depth in each of said plates adaptedto selectively receive the ends of said support member.

3. In a textile machine, a drawing frame comprising a pair of feedrollers, a pair of drawing rollers, a pair of endless belts intermediatesaid rollers, retiu-n members of constant spacing for said belts, platesat both sides of said belts for supporting said return members, arod-shaped member adapted to support the upper side of the lower beltintermediate said return members, and spaced communicating recesses ofdifierent depth in each of said plates adapted to selectively receivethe ends of said support member.

4. In a textile machine a drawing frame comprising a pair of feedrollers, a pair of drawing rollers, a pair of endless belts intermediatesaid rollers, means for driving and guiding said belts at their returnpoints, and a vertically and horizontally adjustable member adapted toincrease the pressure between said belts at a point intermediate saidreturn points.

In a textile machine, a drawing frame comprising a pair of feed rollers,a pair of drawing rollers, a pair of endless belts intermediate saidrollers, means for driving said belts, means for uiding each of saidbelts at one of its return points, a rod-shaped member adapted andarranged to exert a degree of pressure against the operative band sidesof such belts along a line intermediate their respective return pointsso as to create an auxiliary nipping line between said feed rollers anddrawing rollers, and a plurality of means each effective to maintainsaid rod-shaped member in fixed position relative to the belt with whichit isin contact, each of such means being arranged and adapted tomaintain such rod-shaped member in a position different from that inwhich it can be maintained by any of the other means.

6. In a textile machine, a drawing frame comprising a pair of feedrollers,a pair of drawing rollers, a pair of endless belts intermediatesaid rollers, means for driving said belts, means for guiding each ofsaid belts at one of its return points, a rod-shaped member adapted andarranged to exert a degree of pressure against the operative band sidesof such belts along a line intermediate their respective return pointsso as to create an auxiliary nipping line between said feed rollers anddrawing rollers, and a plurality of means each effective to maintainsaid rod-shaped member in fixed position relative to the belt with whichit is in contact, and arranged in different positions lengthwise of anoperative band side and thus effective to maintain such rod-shapedmember in different positions lengthwise of such band side, and makingpossible a change of position of the auxiliary nipping line.

'7. In a textile machine; a drawing frame comprising a. pair of feedrollers, a pair of drawing rollers, a pair of endless belts intermediatesaid rollers, means for driving said beltsymeans for guiding each ofsaid belts at one of its return points, a rod-shaped member adapted andarranged to exert a degree of pressure against the operative band sidesof such belts along a line intermediate their respective return pointsso as to create an auxiliary nipping line between said feed rollers anddrawing rollers, and a plurality of means each adapted to hold saidrod-shaped member in fixed position relative to the band side with whichit is in contact, each such means being arranged and adapted to holdsuch rodshaped member in a position at a distance different from that inwhich it can be held by any of the other means, thus making possiblevariation of pressure between the rod-shaped member and such band side.

8. In a textile machine, a drawing frame comprising a pair of feedrollers, a pair of drawing rollers, a pair of endless belts intermediatesaid rollers, means for driving said belts, means for guiding each ofsaid belts at one of its return points, a rod-shaped member adapted andarranged to exert a degree of pressure against the operative band sidesof such belts along a line intermediate their respective return pointsso as to create an auxiliary nipping line between said feed rollers anddrawing rollers, and plates, one on each side of said belts, each suchplate being provided with a plurality of openings, each such openingbeing adapted to support, by means of a corresponding and oppositelydisposed opening, the rod-shaped member in fixed position i relative tothe belt with which it is in contact,

each corresponding pair of openings being arranged and adapted to holdsuchrod-shaped member in a position different from that in which it canbe held by any of the other sets.

LUDWIG SCHLIPP.

